You are a pelican searching for fish in the ocean from high in the sky. although you see no tasty fish in the open ocean, you soon pass over a series of protected lagoons around an island. each lagoon contains lots of your favorite fish. as you begin descending into one lagoon, you notice that the fish are aggregated into several schools. some of these schools are close to each other, while others are far apart, and you cannot determine any consistent pattern in the distance between the schools. as you descend even closer to the water above a single school, you notice that each fish is approximately the same distance from each other fish. beginning from where you first saw the fish, describe, in order, what patterns of dispersion you noticed the fish exhibiting.

The pelican, has the eyesight of an eagle when fishing for food, as the bird flies closer to the school of fish. It sees the difference of the pattern by the scales that it sees and the reflective of the light of the sun. It catches the one that is easily catching up slowly to the school of fishes.

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]